When the South-Central Junior D league was promoted to Junior C, their league champion competed for the Clarence Schmalz Cup, but a second tier champion also competed for the Junior D OHA Cup. In 1974, 1975, 1976, and 1977, the Stayner Siskins competed on behalf of the then Central league for the All-Ontario Junior D title, victorious in 1974 and 1976.

The Georgian Mid-Ontario Junior "C" Hockey League is the result of the 1994 merger of the Mid-Ontario Junior "C" Hockey League and the short-lived Georgian Junior "C" Hockey League. The league began as a Junior "D" league in the early 1970s.

During the 2004-05 season, the GMOHL played an interlocking schedule with the Western Junior C Hockey League. The GMOHL won the series with 44 victories, 32 losses, and 6 ties.